function md5(string) {  
    function md5_RotateLeft(lValue, iShiftBits) {  
        return (lValue << iShiftBits) | (lValue >>> (32 - iShiftBits));  
    }  
    function md5_AddUnsigned(lX, lY) {  
        var lX4, lY4, lX8, lY8, lResult;  
        lX8 = (lX & 0x80000000);  
        lY8 = (lY & 0x80000000);  
        lX4 = (lX & 0x40000000);  
        lY4 = (lY & 0x40000000);  
        lResult = (lX & 0x3FFFFFFF) + (lY & 0x3FFFFFFF);  
        if (lX4 & lY4) {  
            return (lResult ^ 0x80000000 ^ lX8 ^ lY8);  
        }  
        if (lX4 | lY4) {  
            if (lResult & 0x40000000) {  
                return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);  
            } else {  
                return (lResult ^ 0x40000000 ^ lX8 ^ lY8);  
            }  
        } else {  
            return (lResult ^ lX8 ^ lY8);  
        }  
    }  
    function md5_F(x, y, z) {  
        return (x & y) | ((~x) & z);  
    }  
    function md5_G(x, y, z) {  
        return (x & z) | (y & (~z));  
    }  
    function md5_H(x, y, z) {  
        return (x ^ y ^ z);  
    }  
    function md5_I(x, y, z) {  
        return (y ^ (x | (~z)));  
    }  
    function md5_FF(a, b, c, d, x, s, ac) {  
        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_F(b, c, d), x), ac));  
        return md5_AddUnsigned(md5_RotateLeft(a, s), b);  
    };  
    function md5_GG(a, b, c, d, x, s, ac) {  
        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_G(b, c, d), x), ac));  
        return md5_AddUnsigned(md5_RotateLeft(a, s), b);  
    };  
    function md5_HH(a, b, c, d, x, s, ac) {  
        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_H(b, c, d), x), ac));  
        return md5_AddUnsigned(md5_RotateLeft(a, s), b);  
    };  
    function md5_II(a, b, c, d, x, s, ac) {  
        a = md5_AddUnsigned(a, md5_AddUnsigned(md5_AddUnsigned(md5_I(b, c, d), x), ac));  
        return md5_AddUnsigned(md5_RotateLeft(a, s), b);  
    };  
    function md5_ConvertToWordArray(string) {  
        var lWordCount;  
        var lMessageLength = string.length;  
        var lNumberOfWords_temp1 = lMessageLength + 8;  
        var lNumberOfWords_temp2 = (lNumberOfWords_temp1 - (lNumberOfWords_temp1 % 64)) / 64;  
        var lNumberOfWords = (lNumberOfWords_temp2 + 1) * 16;  
        var lWordArray = Array(lNumberOfWords - 1);  
        var lBytePosition = 0;  
        var lByteCount = 0;  
        while (lByteCount < lMessageLength) {  
            lWordCount = (lByteCount - (lByteCount % 4)) / 4;  
            lBytePosition = (lByteCount % 4) * 8;  
            lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount) << lBytePosition));  
            lByteCount++;  
        }  
        lWordCount = (lByteCount - (lByteCount % 4)) / 4;  
        lBytePosition = (lByteCount % 4) * 8;  
        lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80 << lBytePosition);  
        lWordArray[lNumberOfWords - 2] = lMessageLength << 3;  
        lWordArray[lNumberOfWords - 1] = lMessageLength >>> 29;  
        return lWordArray;  
    };  
    function md5_WordToHex(lValue) {  
        var WordToHexValue = "",  
            WordToHexValue_temp = "",  
            lByte, lCount;  
        for (lCount = 0; lCount <= 3; lCount++) {  
            lByte = (lValue >>> (lCount * 8)) & 255;  
            WordToHexValue_temp = "0" + lByte.toString(16);  
            WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length - 2, 2);  
        }  
        return WordToHexValue;  
    };  
    function md5_Utf8Encode(string) {  
        string = string.replace(/\r\n/g, "\n");  
        var utftext = "";  
        for (var n = 0; n < string.length; n++) {  
            var c = string.charCodeAt(n);  
            if (c < 128) {  
                utftext += String.fromCharCode(c);  
            } else if ((c > 127) && (c < 2048)) {  
                utftext += String.fromCharCode((c >> 6) | 192);  
                utftext += String.fromCharCode((c & 63) | 128);  
            } else {  
                utftext += String.fromCharCode((c >> 12) | 224);  
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);  
                utftext += String.fromCharCode((c & 63) | 128);  
            }  
        }  
        return utftext;  
    };  
    var x = Array();  
    var k, AA, BB, CC, DD, a, b, c, d;  
    var S11 = 7,  
        S12 = 12,  
        S13 = 17,  
        S14 = 22;  
    var S21 = 5,  
        S22 = 9,  
        S23 = 14,  
        S24 = 20;  
    var S31 = 4,  
        S32 = 11,  
        S33 = 16,  
        S34 = 23;  
    var S41 = 6,  
        S42 = 10,  
        S43 = 15,  
        S44 = 21;  
    string = md5_Utf8Encode(string);  
    x = md5_ConvertToWordArray(string);  
    a = 0x67452301;  
    b = 0xEFCDAB89;  
    c = 0x98BADCFE;  
    d = 0x10325476;  
    for (k = 0; k < x.length; k += 16) {  
        AA = a;  
        BB = b;  
        CC = c;  
        DD = d;  
        a = md5_FF(a, b, c, d, x[k + 0], S11, 0xD76AA478);  
        d = md5_FF(d, a, b, c, x[k + 1], S12, 0xE8C7B756);  
        c = md5_FF(c, d, a, b, x[k + 2], S13, 0x242070DB);  
        b = md5_FF(b, c, d, a, x[k + 3], S14, 0xC1BDCEEE);  
        a = md5_FF(a, b, c, d, x[k + 4], S11, 0xF57C0FAF);  
        d = md5_FF(d, a, b, c, x[k + 5], S12, 0x4787C62A);  
        c = md5_FF(c, d, a, b, x[k + 6], S13, 0xA8304613);  
        b = md5_FF(b, c, d, a, x[k + 7], S14, 0xFD469501);  
        a = md5_FF(a, b, c, d, x[k + 8], S11, 0x698098D8);  
        d = md5_FF(d, a, b, c, x[k + 9], S12, 0x8B44F7AF);  
        c = md5_FF(c, d, a, b, x[k + 10], S13, 0xFFFF5BB1);  
        b = md5_FF(b, c, d, a, x[k + 11], S14, 0x895CD7BE);  
        a = md5_FF(a, b, c, d, x[k + 12], S11, 0x6B901122);  
        d = md5_FF(d, a, b, c, x[k + 13], S12, 0xFD987193);  
        c = md5_FF(c, d, a, b, x[k + 14], S13, 0xA679438E);  
        b = md5_FF(b, c, d, a, x[k + 15], S14, 0x49B40821);  
        a = md5_GG(a, b, c, d, x[k + 1], S21, 0xF61E2562);  
        d = md5_GG(d, a, b, c, x[k + 6], S22, 0xC040B340);  
        c = md5_GG(c, d, a, b, x[k + 11], S23, 0x265E5A51);  
        b = md5_GG(b, c, d, a, x[k + 0], S24, 0xE9B6C7AA);  
        a = md5_GG(a, b, c, d, x[k + 5], S21, 0xD62F105D);  
        d = md5_GG(d, a, b, c, x[k + 10], S22, 0x2441453);  
        c = md5_GG(c, d, a, b, x[k + 15], S23, 0xD8A1E681);  
        b = md5_GG(b, c, d, a, x[k + 4], S24, 0xE7D3FBC8);  
        a = md5_GG(a, b, c, d, x[k + 9], S21, 0x21E1CDE6);  
        d = md5_GG(d, a, b, c, x[k + 14], S22, 0xC33707D6);  
        c = md5_GG(c, d, a, b, x[k + 3], S23, 0xF4D50D87);  
        b = md5_GG(b, c, d, a, x[k + 8], S24, 0x455A14ED);  
        a = md5_GG(a, b, c, d, x[k + 13], S21, 0xA9E3E905);  
        d = md5_GG(d, a, b, c, x[k + 2], S22, 0xFCEFA3F8);  
        c = md5_GG(c, d, a, b, x[k + 7], S23, 0x676F02D9);  
        b = md5_GG(b, c, d, a, x[k + 12], S24, 0x8D2A4C8A);  
        a = md5_HH(a, b, c, d, x[k + 5], S31, 0xFFFA3942);  
        d = md5_HH(d, a, b, c, x[k + 8], S32, 0x8771F681);  
        c = md5_HH(c, d, a, b, x[k + 11], S33, 0x6D9D6122);  
        b = md5_HH(b, c, d, a, x[k + 14], S34, 0xFDE5380C);  
        a = md5_HH(a, b, c, d, x[k + 1], S31, 0xA4BEEA44);  
        d = md5_HH(d, a, b, c, x[k + 4], S32, 0x4BDECFA9);  
        c = md5_HH(c, d, a, b, x[k + 7], S33, 0xF6BB4B60);  
        b = md5_HH(b, c, d, a, x[k + 10], S34, 0xBEBFBC70);  
        a = md5_HH(a, b, c, d, x[k + 13], S31, 0x289B7EC6);  
        d = md5_HH(d, a, b, c, x[k + 0], S32, 0xEAA127FA);  
        c = md5_HH(c, d, a, b, x[k + 3], S33, 0xD4EF3085);  
        b = md5_HH(b, c, d, a, x[k + 6], S34, 0x4881D05);  
        a = md5_HH(a, b, c, d, x[k + 9], S31, 0xD9D4D039);  
        d = md5_HH(d, a, b, c, x[k + 12], S32, 0xE6DB99E5);  
        c = md5_HH(c, d, a, b, x[k + 15], S33, 0x1FA27CF8);  
        b = md5_HH(b, c, d, a, x[k + 2], S34, 0xC4AC5665);  
        a = md5_II(a, b, c, d, x[k + 0], S41, 0xF4292244);  
        d = md5_II(d, a, b, c, x[k + 7], S42, 0x432AFF97);  
        c = md5_II(c, d, a, b, x[k + 14], S43, 0xAB9423A7);  
        b = md5_II(b, c, d, a, x[k + 5], S44, 0xFC93A039);  
        a = md5_II(a, b, c, d, x[k + 12], S41, 0x655B59C3);  
        d = md5_II(d, a, b, c, x[k + 3], S42, 0x8F0CCC92);  
        c = md5_II(c, d, a, b, x[k + 10], S43, 0xFFEFF47D);  
        b = md5_II(b, c, d, a, x[k + 1], S44, 0x85845DD1);  
        a = md5_II(a, b, c, d, x[k + 8], S41, 0x6FA87E4F);  
        d = md5_II(d, a, b, c, x[k + 15], S42, 0xFE2CE6E0);  
        c = md5_II(c, d, a, b, x[k + 6], S43, 0xA3014314);  
        b = md5_II(b, c, d, a, x[k + 13], S44, 0x4E0811A1);  
        a = md5_II(a, b, c, d, x[k + 4], S41, 0xF7537E82);  
        d = md5_II(d, a, b, c, x[k + 11], S42, 0xBD3AF235);  
        c = md5_II(c, d, a, b, x[k + 2], S43, 0x2AD7D2BB);  
        b = md5_II(b, c, d, a, x[k + 9], S44, 0xEB86D391);  
        a = md5_AddUnsigned(a, AA);  
        b = md5_AddUnsigned(b, BB);  
        c = md5_AddUnsigned(c, CC);  
        d = md5_AddUnsigned(d, DD);  
    }  
    return (md5_WordToHex(a) + md5_WordToHex(b) + md5_WordToHex(c) + md5_WordToHex(d)).toLowerCase();  
}  
module.exports.md5 = md5; 